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Патент USA US2108379

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Feb. l5, 1938.
' ’
'
R. l.. LEFFLER
"
«2,108,379-
HOT STRIP ROLLING
Filed May v19,- 1936
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Feb. 15, 19385.
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2,108,379
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HOT STRIP- ROLLING
I Filed‘May 19, 195e
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2,108,379
Patented Feb. 15, 1938 _
UNITED STATES PATENT OFFICE
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2,108,379>
HOT STRIP ROLLING
Ross
Leiîler, McKeesport, Pa.
ApplicationMay 19, 1936, Serial No. 80,594
3 Claims. (Cl. 80--60)
4'I'his’invention relates to the rolling of metal, rolls having grooves providing 'diagonal square
and is particularly concerned with the hot roll
ing of steel, one of the objects being to roll sec
tions or shapes, particularly rectangular shapes,
5 of greater width than thickness in such a man
ner that a greater portion of the surface of the
metal is worked than.~was heretofore possible.
A more specific object is to hot-roll steel strip
so that its entire surface receives at least some
10 working. The term “strip”-as here used is in
tended to cover products such as sheet bar, skelp,
or diamond surfaces 3 which work a majority
» of the surface'of the billet and iiat surfaces 4
that are oppositely spaced to provide recesses
into which the previously rolled corners I may 5
spread. This'flrst pass is open since edge con
trol is not necessary at this time.
Pass #2 vshown by Figure 3 differs somewhat in
that it isa closed one to provide some edge con
trol and its diagonal square or diamond is of re 10
duced area. -Otherwise, surfaces Ila and 4a are
etc. Other objects may be inferred from the fol
for the same purposes ~as the surfaces' 3 and 4
lowing disclosure.
in the case of the pass #1.
'
As an example of the invention, a steel bloom
15 is heated to a proper rolling temperature and
worked into a square billet by any conventional
method that will produce oppositely rolled cor
ners. Ordinarily, this necessitates diagonal roll
ing, the oval square, diamond square and diamond
O methods being examples. Then, on the same
heat, this billet is rolled on its opposite diagonal
to ñatten it into strip by spreading so that its
previously rolled corners become the edges of
this strip. To do this, the corners of the billet
25 between its previously'rolled corners are rolled
in such a manner as to permit lateral spreading
of its previously rolled corners.
,
.
.
Pass #3 shown by Figure 4 is a closed flat pass
which completely ñattens the billet and provides 15
for the edge control required to assure strip of
the proper Width. This pass and passes #4 and
#5 illustrated by Figures 5 and 6 may be con
sidered as conventional iiat passes, and in them
the strip is further formed and finished.
20
The showing of the work by broken lines and
the pass by solid lines, as explained in connec
tion with pass #1, is maintained throughout these
other figures. It is to be observed that the cor
ners I of the billet eventually become the edges L25
of the strip, the corners 2 disappearing at pass
#3 to become the flattened section of thestrip.
The work does not require turning. In passes
#l and #2 the surfaces- 3 and 3a provide thick
ened central sections of metal which eventually 30
The described procedureresults in the entire
surface of the strip being worked. It is to be
understood that the volume of the vmetal is pro
portioned along with the various reductions t0 flows laterally and longitudinally into width and
provide a strip of the width and thickness de
length, this eliminating the lateral stretching
sired.
-usually required to provide the strip with its
Referring to the accompanying drawings:
proper Width. -The manner in which the width’
Figure 1 shows the last pass in the reduction „ and thickness of the strip can be controlled or
of the bloom to the billet.
'
varied is obvious.
'
Figure 2 shows the pass beginning the reduc- '
An important advantage connected with what
tion of this billet to the desired strip.
has been disclosed consists in the fact that the
Figures 3 through 6 show the successive passes edges of the strip are actually the corners I
40 required to produce the strip.
rolled into the billet by the last pass used in its
Figure 1 represents the final pass 4usedl in formation and which is illustrated by Figure 1._ 40
reducing the bloom to the billet. The corners It is obvious that these edges ewill be superior
rolled onto the billet by this pass are numeraled to those produced by the methods hel Jofore in
I, and the corners that cannot beso rolled are
45 numeraled 2. This figure is included only to em
.Another great advantage is that it is possible
' phasize the fact that the rolling .of the billet must to construct passes #1 and #2 so that a great
be done in such a manner as toprovide' opposite majority of the surface of the steel is worked
rolled corners.
.
while it is still in a plastic state. Although not
This billet is now entered on its opposite diago
previously mentioned, it is to be understood that
nal into pass #1 -shown by _Figure 2, the billet in the interests of economy the rolling must be 50
being here illustrated by the broken lines and done on a single 'heat from the bloom through '
vthe outline of the pass by the solid lines. It will the billet and down to the final strip, and that
be’` noted that the ‘diagonal between the corners due to rapid cooling the steel may not be in a
I’is now horizontal, While that between the cor
plastic state after it reaches pass #4. In the
vogue.
55 ners- 2 is `vertical.
The pass itself is formed by
'
-
-usual lmethods of rolling strip the work is kept
2
dieser@
in a rectangular section at all times, and due to
its relatively great thickness in the first two or
three passes only a relatively small proportion
of its surface is actually worked. By rolling the
Y
.
l. A hot strip rolling method including pro
ingot on its diagonal in the manner described it
ducing a billet with rolled opposite corners and
rolling down parts of said billet between said
corners while permitting the latter to spread and
is possible to use a pass like that shown by Fig
become edges of the strip.
ure 2 wherein diagonal square or diamond grooves
of relatively great depth are provided tov work
a great majority of the metal’s surface, the only
2. A hot strip rolling method including pro
ducing a rectangular billet by diagonal rolling
portions unworked being those which spread into
and rolling said billet on its opposite diagonal to
iiatten it into strip and to spread its previously 10
the recesses .4 and which have already been
rolled corners so they become the edges of said
worked by the previous rolling ci the square
strip.
billet on its opposite diagonal. The same advan
3. A hot strip rolling method including pro
ducing a rectangular billet by diagonal rolling,
rolling against a majority of the surface of said
billet on its opposite diagonal while permitting
its corners to spread laterally, ñattening into
strip by rolling on its same diagonal and form
tages are involved by pass #2, while pass #3
15
l’ claim:
works the metal sufficiently thin to accomplish
the same thing to a considerable extent.
The term “plastic state” as used above is not
intended to mean that the steel is not suiilcient
ly malleable to be rolled in passes #4, #5 and
20 #6, but means that the steel falls to a tempera
ture in or below its critical range about the time
it reaches pass #4.
`
ing said corners into the edges of said strip.
Ross i..
20
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